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Terrestrial Group Progress. All-Hand Meeting Dec 2, 2011. Working Group IB: Terrestrial. Models in BioEarth-Land. VIC: large-scale physical hydrology. Streamflow routing. CropSyst : point-scale cropping systems. ColSim : Reservoirs and Water Management.

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terrestrial group progress

Terrestrial Group Progress

All-Hand Meeting

Dec 2, 2011

models in bioearth land
Models in BioEarth-Land

VIC: large-scale physical hydrology

Streamflow routing

CropSyst: point-scale cropping systems

ColSim: Reservoirs and Water Management

RHESSys: watershed-scaleecohydrology

progress towards vic rhessys integration
Progress Towards VIC/RHESSys Integration
  • VIC grids converted from latitude/longitude boxes to watershed boundaries (see right)
  • RHESSys will run at a finer resolution (for each “patch”) within each VIC grid, handling all hydrology
  • RHESSys patches resolution will be finer within riparian areas and coarser in upland areas; these scales are one of our research questions
  • Patches will be sub-divided statistically to increase computational efficiency (i.e., the patches can be bigger)
  • RHESSys will route flow within the VIC grid; a separate routing algorithm will be used to route flow contributed from the VIC grids
progress in dataset development and offline simulations
Progress in Dataset Development and Offline Simulations

1) 3-arc (about 90 meters) resolution DEM data over the Pacific North West; delineation of watershed boundaries with different size/levels;

2) 1-km resolution aggregated CDL 2010 (Cropland Data Layer) data sets, each grid has fractional area of different crop types and natural vegetations;

3) Generated metdata for running RHESSys from VIC input met data;

4) Improved VIC by introducing an option that outputting whole region’s daily results as one single arc/info ascii format grid file which increased the overall computational efficiency by about 70%;

5) Added a sub-routine in RHESSys to read netcdf format metdata;

6) Made a simulation with VIC for the period of 1915-2006 over the PNW.


Fractional vegetation cover with 1-km resolution aggregated from CDL data sets (Left: Corn; Right: Winter Wheat)

Offline VIC simulations: the anomalies of evapotranspiration, runoff, and precipitation during 1915-2006 over the Pacific North West (PNW)
offline vic simulations
Offline VIC simulations




Linear trend of estimated annual ET and runoff with VIC model and the precipitation during 1915-2006 (unit: percentage)

n fixation addition to rhessys
N Fixation Addition to RHESSys
  • Current N cycle structure

PSN: Farquhar model + Soil mineral N available

      • Soil mineral N-avail: decomposition + uptake - denitrification
      • Potential PSN (farq): N demand
      • If soil mineral N-avail < N demand, reduce PSN
  • N fixation addition
      • If soil mineral N-avail < N demand, use some PSN to fix N
      • At carbon costs, as a function of temperature

Proposed Focus Sites

Wet Site: Mckenzie River Watershed

(Willamette River Basin)

Dry Site: TBD (Deschutes River Basin)




Modified after “Map of Oregon showing the Willamette and Deschutes Basins”(http://pnwho.forestry.oregonstate.edu/site/index.php)

proposed research questions
Proposed Research Questions

The following four questions are in line with our milestone for 2012-2013 and each will lead to a publishable manuscript:

  • Q1: How does global warming affect N retention and export at a local/patch scale (no redistribution)?
  • Q2: How does watershed redistribution of moisture and N input impact N retention and export under global warming?
  • Q3: How does model implementation scale affect N retention and export and the sensitivity of N processes?
  • Q4: How do changes in species and disturbances in watersheds affect N retention and export?
news progress from john
NEWS Progress (from John)
  • Headway in the development of a global, seasonal NEWS-DIN model, and the insights gained from that effort can be put to use in BioEarth. 
  • We are also starting to dig into the Millennium Assessment scenario runs for the continental US, an effort which is also relevant to BioEarth, though not a BioEarth product. 
  • Optimistic about prospects for bringing a good student on board for NEWS/BioEarth work in the fall of 2012.
kirti rajagopalan civil and environmental engineering
Kirti Rajagopalan, Civil and Environmental Engineering
  • Research Area: Impacts of climate change on irrigated agricultural productivity in the CRB
  • Progress on her dissertation (and towards BioEarth) through our Dep. of Ecology CRB supply and demand forecast
tools developed
Tools Developed
  • Developed the coupled crop hydrology model VIC-CropSyst
  • Developed an integrated framework involving the biophysical components VIC-CropSyst, reservoir modeling and water rights information for curtailment as well as an economics component Columbia River Basin (some components for the Washington part of the Columbia River Basin only)
a pplication of tools
Application of tools
  • To project 2030s water supply and irrigation demand in the Columbia River Basin
  • To study the effect of climate change as well as economics on irrigated agriculture (crop water demand, cropping pattern and crop yield) at the watershed scale.
  • Lessons learned will be used the improve the biophysical model components for BioEarth
biophysical economic modeling integration
Biophysical/Economic Modeling Integration


Modeling Steps


Biophysical Modeling:

VIC-CropSyst, Reservoirs, Curtailment

Future Climate Scenario

  • Water Supply
  • Irrigation Water Demand
  • Unmet Irrigation Water Demand
  • Effects on Crop Yield
  • Adjusted Crop Acreage
  • Selective Deficit Irrigation

Water Management Scenario

  • Crop Yield (as impacted by climate and water availability)

Economic Scenario

Economic Modeling:

Agricultural Producer Response

keyvan malek biological systems engineering
Keyvan Malek, Biological Systems Engineering
  • Research Area: VIC-CropSyst Case study on Yakima River basin irrigated agriculture
    • Climate change impacts
    • Impacts of irrigation efficiency on distribution of crop yield across the basin
    • Nitrogen efficiency
  • Progress towards BioEarth development
    • Generation of soil file over PNW and western US domains (with Roger Nelson)
    • Improvement of VIC-CropSyst dynamic coupling
julian reyes civil and environmental engineering nspire
Julian Reyes, Civil and Environmental Engineering (NSPIRE)
  • Research Question: How does atmospheric deposition of nitrogen (ADN) change in response to global change, and how does this deposition affect nutrient cycling and potential C sequestration in the terrestrial biosphere?
    • Investigation through empirical and process-based models (i.e. RHESSys, nitrogen dilution curve)
    • In particular, look at grasslands and forests.
Justin Poinsatte, Biological SciencesWhat are the impacts of atmospheric nitrogen deposition on sensitive, high elevation ecosystems?

Influences on:

  • Biogeochemical cycling
  • Vegetation physiology
  • Microbial and vegetation communities
research approach
Research Approach
  • Ecosystem Modeling
    • Determine response to N deposition
  • Field Experiment
    • N deposition levels as field treatments
  • Analysis
    • Parameterize model with field data
    • Compare model output to field measurements
n deposition sarah anderson biological sciences
N DepositionSarah Anderson, Biological Sciences

Research Questions

  • What are the sources contributing N deposition?
  • What are the patterns of N transport?
  • What effect does this have to sensitive ecosystems in the Pacific Northwest?

Goal: Answer these questions by combining stable isotope techniques & regional modeling

Current Projects Analyzing

NADP Samples & Snowpack